How can I end this depression?

Life is unfair at times; or at least it seems so. Whenever I'm depressed, however, I look at what I have, not what I don't have; I look at those who are truely in terrible shape, much more than I am; I look at the things I have to be thankful for, and try not to sweat the small stuff. Most of all, I try not to take life so seriously; for in doing so, you miss so much of the good stuff :)